BIS(1-MERCAPTOPROPYL)SULFIDE

CAS: 53897-60-2 FLAVORING AGENT OR ADJUVANT

BIS(1-MERCAPTOPROPYL)SULFIDE is a chemical compound used as a flavoring agent in food formulations. It has sulfurous, alliaceous sensory characteristics and has been evaluated by expert flavor panels. Its regulatory status in foods is primarily based on flavor industry evaluations and international flavoring specifications rather than direct numeric regulatory limits.

What It Is

BIS(1-MERCAPTOPROPYL)SULFIDE is a chemical flavoring substance identified by CAS number 53897-60-2 and classified as a flavoring agent or adjuvant for use in food products. It belongs to a class of organosulfur compounds characterized by sulfur atoms bonded to organic chains, imparting distinct sensory properties often described as sulfurous or alliaceous. In flavor science, such compounds are typically used in very low concentrations to contribute specific savory or aromatic nuances in formulations that aim to emulate natural flavors or enhance certain taste profiles. The compound may also be referred to by alternative systematic or trade names that reflect its molecular structure and sulfur-containing functional groups. Its inclusion in flavor ingredient listings is supported by expert panel evaluations that consider its typical functional impact and usage levels in food systems. Flavoring agents like BIS(1-MERCAPTOPROPYL)SULFIDE are used by food and beverage formulators to achieve desired sensory outcomes without contributing substantive nutritional content. Because of the inherent potency of many sulfur-containing flavor compounds, concentrations used in food applications are generally very small relative to the overall formulation. The technical classification of the compound as a flavoring agent or adjuvant reflects its role in influencing sensory perception rather than serving as a bulk ingredient, preservative, nutrient, or processing aid. Although the compound has specific identifiers and structural descriptors used in chemical databases and regulatory inventories, it is not represented by a formal INS or E-number that many other food additives carry. As with many specialized flavor ingredients, its recognition in international food additive specifications relies on expert evaluation and consensus documentation rather than prescriptive numeric limits in general food additive legislation.

How It Is Made

The exact industrial synthesis methods for BIS(1-MERCAPTOPROPYL)SULFIDE are specialized and not typically detailed in general food regulatory sources, but high-level chemical manufacturing principles can be described. Organosulfur compounds like this one are often produced through controlled reactions that introduce sulfhydryl (thiol) groups onto an organic backbone. Typical chemical pathways may involve thiol-alkylation reactions, sulfur bridge formation, and purification steps designed to yield the desired compound with defined purity characteristics. Because of its sulfurous nature and associated odor, synthesis and handling are performed under controlled conditions to manage sensory impacts and worker safety. Commercial production of flavor ingredients must adhere to relevant chemical manufacturing and food-grade purity practices, even if the compound itself is used in very low amounts in food applications. This often includes analytical verification of composition, control of residual impurities, and compliance with any applicable specifications established by international expert panels or flavor industry organizations. For flavorings, specifications may include limits on byproducts and impurities that could affect sensory quality or raise safety considerations. Because BIS(1-MERCAPTOPROPYL)SULFIDE is used in trace levels, bulk production does not equate to large-scale direct food addition. Instead, intermediate formulations or blends may be prepared and diluted as part of the flavor creation process. Quality control and consistency are important aspects of how this compound is made available to formulators, even if the public documentation of production methods is limited in open regulatory databases. The manufacturing context for flavor ingredients like this compound reflects a balance between chemical synthesis capabilities and sensory science requirements. It involves specialized organic chemistry practices rather than broad commodity chemical production, with emphasis on controlling odor profiles and ensuring material consistency for use in end formulations.

Why It Is Used In Food

BIS(1-MERCAPTOPROPYL)SULFIDE is used in food products primarily to contribute or enhance specific sensory characteristics that are desirable in certain savory or complex flavor profiles. Sulfur-containing compounds are known in flavor chemistry to provide allies with notes that can resemble garlic, onion, savory, or other rich aromatic components when used at controlled low levels. Such characteristics are especially relevant in products that aim to replicate or augment complex natural flavors, reduce reliance on raw ingredients with variable quality, or achieve targeted sensory outcomes more efficiently. The technical function of a flavoring agent like BIS(1-MERCAPTOPROPYL)SULFIDE is not to contribute nutritional value or bulk to the food product, but rather to influence the perception of flavor and aroma. This can be especially useful in formulated products such as savory snacks, processed meats, seasoning blends, soups, and sauces where achieving a consistent flavor impact is critical. By understanding how specific compounds interact with sensory receptors, flavorists can leverage these ingredients to build layers of taste that resonate with consumer expectations. Flavoring agents are used in combination with many other ingredients to create a balanced sensory experience. BIS(1-MERCAPTOPROPYL)SULFIDE may be paired with other sulfur-containing compounds or complimentary flavor molecules to achieve nuanced profiles. Its usage is typically guided by formulation expertise and sensory evaluation panels that determine optimal levels to achieve the desired effect without overwhelming other components or generating off-notes. Overall, the use of specialized flavoring agents like BIS(1-MERCAPTOPROPYL)SULFIDE reflects the complex art and science of modern flavor formulation, where precise control of sensory attributes is key. These agents enable producers to deliver consistent taste experiences across batches and products, especially when natural ingredient variability or processing constraints might otherwise lead to inconsistency.

Adi Example Calculation

An illustrative example of how an acceptable daily intake (ADI) concept might be applied can help clarify how regulatory safety evaluation works, even when a numeric ADI is not defined. Suppose a hypothetical flavoring agent were assigned an ADI of 1 mg/kg body weight per day based on toxicological data. For an adult weighing 70 kg, this would translate to a theoretical maximum of 70 mg per day that could be consumed over a lifetime without appreciable health risk. Typical actual intake for most flavoring agents in food would be orders of magnitude lower, often measured in micrograms per kilogram of food, reflecting the high potency of flavor chemicals and limited use levels. Although BIS(1-MERCAPTOPROPYL)SULFIDE does not have a published numeric ADI, the example illustrates how regulators use ADI values as a comparative tool. If a compound’s typical exposure from all sources is far below a defined ADI, this provides reassurance that current uses are safe. For flavor chemicals assessed qualitatively as having no safety concern at current intake levels, industry exposure estimates and expert evaluations support conclusions that routine consumption does not approach any hazardous thresholds. This conceptual ADI example highlights the significant difference between theoretical maximum safe intake and actual exposure from formulated foods, which is typically much lower. Such examples help explain risk assessment fundamentals without implying personal intake advice.

Safety And Health Research

Safety and health research around flavoring agents like BIS(1-MERCAPTOPROPYL)SULFIDE focuses on evaluating potential toxicological endpoints, typical exposure levels, and whether use at intended concentrations poses any risk to human health. International expert committees such as JECFA examine available toxicological data, including studies on genotoxicity, acute oral toxicity, subchronic and chronic exposures, and any available reproductive or developmental data. For this compound, the JECFA evaluation concluded that there is no safety concern at current levels of intake when used as a flavoring agent, reflecting an overall assessment that typical consumer exposures are well below any thresholds of toxicological concern identified in the data reviewed. Such conclusions are based on a combination of chemical structural considerations, available experimental results, and usage information provided by industry. They provide a science-based context for regulators and formulators to understand potential health implications. Because sulfur-containing flavor compounds can be potent and odorous, much of the safety research is concerned with establishing appropriate exposure margins and ensuring that typical use levels in food products remain far below any doses associated with adverse effects in experimental models. The expert evaluations typically consider metabolic pathways, the potential for bioaccumulation, and how the compound is processed in the body. In the absence of specific adverse signals at relevant exposure levels, expert panels use conservative safety factors to characterize acceptable intake levels qualitatively. It is important to differentiate between broad safety evaluations and specific health claims. Regulatory evaluations by JECFA and similar bodies do not constitute evidence of beneficial health effects, nor do they suggest any therapeutic properties. Rather, they ensure that routine consumption under intended usage scenarios does not pose unreasonable risks. Publicly available safety research data for many specialized flavor chemicals is limited compared to nutrients or drugs, and expert panels fill this gap by applying established risk assessment frameworks to characterize safety margins and provide guidance to industry and regulators.

Regulatory Status Worldwide

The regulatory status of BIS(1-MERCAPTOPROPYL)SULFIDE reflects its recognition and evaluation as a flavoring agent by expert bodies rather than explicit numeric approvals in general food additive laws. In the United States, the compound appears in the Substances Added to Food inventory maintained by the Food and Drug Administration (FDA), which includes flavoring substances evaluated by the Flavor and Extract Manufacturers Association (FEMA) Expert Panel and the Joint FAO/WHO Expert Committee on Food Additives (JECFA). Its inclusion in this inventory indicates that authoritative bodies have documented its use as a flavoring agent or adjuvant, and its FEMA number (4297) is associated with such evaluations. However, inclusion in the FDA inventory does not by itself constitute a formal approval under a specific Code of Federal Regulations section, and there is no explicit CFR citation assigning numeric usage limits for this compound in broad food additive regulations. This reflects the way many specialized flavor chemicals are managed through expert panel evaluations and industry consensus documentation rather than detailed prescriptive legal standards. Internationally, BIS(1-MERCAPTOPROPYL)SULFIDE is recognized in flavor specification listings such as the JECFA flavoring evaluations, where it is identified by JECFA number 1709. JECFA evaluations provide scientific context regarding its functional class and safety considerations at current levels of intake when used as a flavoring agent, noting no safety concern at typical usage levels. This evaluation framework is used by regulators and industry groups worldwide to inform risk assessment and permissibility in food applications. Different jurisdictions may incorporate such evaluations into their own food additive inventories or flavoring lists, but specific numeric legal standards may not always be present for flavoring substances of this type. As such, the regulatory landscape for BIS(1-MERCAPTOPROPYL)SULFIDE is shaped by expert evaluation processes and inclusion in authoritative food ingredient inventories rather than direct prescription in broad legislative clauses.

Taste And Functional Properties

BIS(1-MERCAPTOPROPYL)SULFIDE exhibits sensory characteristics typical of sulfur-containing flavor compounds. These often include notes described as sulfurous, alliaceous, and reminiscent of garlic or onion when evaluated in controlled sensory panels at appropriate dilutions. Such sensory impressions are valuable for constructing savory or umami-leaning flavor profiles, especially in complex food systems, and allow flavorists to impart richness and depth without relying exclusively on raw ingredients. Sensory impact is generally observed at very low concentrations relative to the overall formulation. The functional properties of this compound in food systems include its volatility and interaction with olfactory receptors, which contribute to perceived aroma and taste. Organosulfur compounds often have relatively high volatility compared to many non-volatile food constituents, meaning they readily contribute to aroma perception when food is heated or consumed, even at trace levels. The stability of such compounds under food processing conditions, including moderate heat and pH variations, is an important consideration in formulation design. Expert flavor panels often evaluate how these compounds behave in specific matrices to ensure desired sensory impact without generating undesirable byproducts. Due to its sulfurous nature, careful control of concentration and context within a flavor blend is essential. Excess can lead to overpowering or unpleasant sensory effects, while appropriate low-level use can enhance complexity and consumer appeal. The presence of sulfur atoms contributes to characteristic chemical behavior that interacts with receptors in the mouth and nose differently than many other classes of flavoring agents. This makes sulfur-containing compounds particularly effective at augmenting savory notes but also demands careful formulation oversight. Functional behavior in food may also be influenced by solubility and partitioning characteristics. Organosulfur compounds may be slightly soluble in water but often exhibit better solubility in alcohol or lipid phases, affecting how they distribute in composite food systems. These physicochemical properties are part of the technical considerations that flavor chemists account for when incorporating BIS(1-MERCAPTOPROPYL)SULFIDE into broader flavor systems.

Acceptable Daily Intake Explained

Acceptable daily intake (ADI) is a concept used in risk assessment to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk, based on available toxicological data and conservative safety factors. For many flavoring agents, including BIS(1-MERCAPTOPROPYL)SULFIDE, expert evaluators like JECFA consider both the chemical’s intrinsic toxicity and expected exposure levels in typical food use. When they conclude that there is "no safety concern at current levels of intake," this reflects a qualitative application of the ADI concept, indicating that routine dietary exposure is sufficiently low that it does not approach thresholds that would warrant numeric ADI specification. In regulatory practice, numeric ADIs are often assigned when there is sufficient data to define a no-observed-adverse-effect level (NOAEL) or benchmark dose, and then apply uncertainty factors to account for interspecies differences and human variability. In the case of this compound, the lack of a numeric ADI in published documentation suggests that available data and typical use patterns did not necessitate defining a numeric value. Instead, expert evaluators have expressed a qualitative safety reassurance based on a weight-of-evidence approach. It is important to recognize that the absence of a numeric ADI does not imply a lack of safety evaluation; rather, it reflects a conclusion that use levels are inherently low and do not raise concerns when considered alongside conservative exposure estimates. Consumers and industry stakeholders should understand that an ADI is not a recommended intake level but a risk assessment tool that helps regulators and manufacturers ensure that cumulative exposure remains within bounds considered safe by scientific consensus. For flavoring agents like BIS(1-MERCAPTOPROPYL)SULFIDE, this framework supports responsible usage in formulated products without implying specific numeric consumption guidelines.

Comparison With Similar Additives

BIS(1-MERCAPTOPROPYL)SULFIDE can be compared with other sulfur-containing flavoring agents and savory enhancers that contribute similar aromatic qualities in food applications. Compounds such as diallyl disulfide, allyl mercaptan, and other organosulfur chemicals contribute characteristic notes that flavorists use to achieve specific sensory goals. These compounds differ in their chemical structure, volatility, and sensory thresholds, which influence how they are used in formulations. For example, diallyl disulfide, another sulfur-containing compound associated with garlic-like notes, has a different volatility and odor profile, leading formulators to select it for particular product types or sensory impacts. Comparison also extends to how these additives are evaluated by regulatory bodies. While many organosulfur flavoring chemicals have been subject to expert panel assessments and documented in flavor ingredient inventories, numeric regulatory specifications (such as ADIs or legal usage levels) are often not assigned unless sufficient data exist and exposure patterns suggest the need. This places BIS(1-MERCAPTOPROPYL)SULFIDE and similar compounds in a category where safety evaluations focus on qualitative assessments of no safety concern at typical intake levels rather than strict numeric limits. Such contexts underscore the specialized nature of flavoring agents compared to more widely regulated food additives like preservatives or sweeteners. Understanding similarities and differences among sulfur-containing flavoring agents helps inform formulation decisions and regulatory interpretation. Each compound’s sensory contribution, stability under processing, and evaluation history shape how it is incorporated into products and how regulators and expert panels contextualize safety. While structural similarities may exist, the functional nuances of each additive mean that usage patterns and sensory goals vary widely across applications.

Common Food Applications Narrative

BIS(1-MERCAPTOPROPYL)SULFIDE is integrated into a range of formulated food applications where nuanced savory or aromatic notes are desired. In broad terms, this includes savory snacks, seasoning blends, sauces, soups, and processed meats that benefit from savory depth or complexity. Within such product categories, flavor professionals carefully balance sulfur-containing compounds with other flavor volatiles to achieve consistent and appealing sensory impressions. In savory snack products, for example, achieving a balance of roasted, umami, and aromatic notes often involves blending multiple flavor chemicals, including those that contribute subtle sulfurous characteristics. BIS(1-MERCAPTOPROPYL)SULFIDE may be included in such blends to replicate the complexity associated with cooked onions or garlic without relying on higher levels of raw ingredients, which can introduce variability or processing challenges. Similarly, in seasoning blends for chips or crackers, sulfurous flavorants help round out profiles and can interact synergistically with other compounds to enhance overall taste perception. In sauces and soups, flavorists often aim to replicate traditional culinary profiles where savory, aromatic notes are central to consumer acceptance. BIS(1-MERCAPTOPROPYL)SULFIDE may be part of a larger palette of flavoring agents that collectively emulate the sensory signature of hearty broths or seasoned gravies. Its contribution, while subtle and technical in nature, supports the intended character of these products without dominating the flavor landscape. In processed meats, where flavor stability and consistency are critical, specialized flavoring agents may be used to augment natural meat flavors or compensate for losses during processing. Sulfur-containing compounds can complement Maillard reaction notes and help maintain desired sensory qualities over shelf life. Across these broad applications, the use of BIS(1-MERCAPTOPROPYL)SULFIDE is guided by sensory science and formulation expertise rather than prescriptive numeric usage levels published in general food additive legislation.

Safety & Regulations

FDA

  • Notes: Inclusion in FDA Substances Added to Food inventory indicates recognition by expert panels but does not equate to a specific approved regulation citation in the CFR.

EFSA

  • Notes: No specific EFSA numeric ADI identified in authoritative sources.

JECFA

  • Notes: JECFA concluded no safety concern at current intake levels when used as a flavouring agent, without defining a numeric ADI.

Sources

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